Investors can learn from Earth Day's lessons

Next week, we observe Earth Day. First celebrated in 1970, Earth Day has grown into an international movement whose goal is to raise awareness of the need to take action to sustain a healthy, sustainable environment. You can do your part through recycling and other measures, but you can also apply some of the lessons of Earth Day to your financial situation — and, in particular, to your approach to investing.

Give these ideas some thought:

• Make the most of your existing resources. One of the most valuable lessons of Earth Day deals with the need to be responsible managers of the natural reso...